Release 4.7 drivers/acpi/pmic/intel_pmic_xpower.c
/*
* intel_pmic_xpower.c - XPower AXP288 PMIC operation region driver
*
* Copyright (C) 2014 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/mfd/axp20x.h>
#include <linux/regmap.h>
#include <linux/platform_device.h>
#include <linux/iio/consumer.h>
#include "intel_pmic.h"
#define XPOWER_GPADC_LOW 0x5b
static struct pmic_table power_table[] = {
{
.address = 0x00,
.reg = 0x13,
.bit = 0x05,
},
{
.address = 0x04,
.reg = 0x13,
.bit = 0x06,
},
{
.address = 0x08,
.reg = 0x13,
.bit = 0x07,
},
{
.address = 0x0c,
.reg = 0x12,
.bit = 0x03,
},
{
.address = 0x10,
.reg = 0x12,
.bit = 0x04,
},
{
.address = 0x14,
.reg = 0x12,
.bit = 0x05,
},
{
.address = 0x18,
.reg = 0x12,
.bit = 0x06,
},
{
.address = 0x1c,
.reg = 0x12,
.bit = 0x00,
},
{
.address = 0x20,
.reg = 0x12,
.bit = 0x01,
},
{
.address = 0x24,
.reg = 0x12,
.bit = 0x02,
},
{
.address = 0x28,
.reg = 0x13,
.bit = 0x02,
},
{
.address = 0x2c,
.reg = 0x13,
.bit = 0x03,
},
{
.address = 0x30,
.reg = 0x13,
.bit = 0x04,
},
{
.address = 0x38,
.reg = 0x10,
.bit = 0x03,
},
{
.address = 0x3c,
.reg = 0x10,
.bit = 0x06,
},
{
.address = 0x40,
.reg = 0x10,
.bit = 0x05,
},
{
.address = 0x44,
.reg = 0x10,
.bit = 0x04,
},
{
.address = 0x48,
.reg = 0x10,
.bit = 0x01,
},
{
.address = 0x4c,
.reg = 0x10,
.bit = 0x00
},
};
/* TMP0 - TMP5 are the same, all from GPADC */
static struct pmic_table thermal_table[] = {
{
.address = 0x00,
.reg = XPOWER_GPADC_LOW
},
{
.address = 0x0c,
.reg = XPOWER_GPADC_LOW
},
{
.address = 0x18,
.reg = XPOWER_GPADC_LOW
},
{
.address = 0x24,
.reg = XPOWER_GPADC_LOW
},
{
.address = 0x30,
.reg = XPOWER_GPADC_LOW
},
{
.address = 0x3c,
.reg = XPOWER_GPADC_LOW
},
};
static int intel_xpower_pmic_get_power(struct regmap *regmap, int reg,
int bit, u64 *value)
{
int data;
if (regmap_read(regmap, reg, &data))
return -EIO;
*value = (data & BIT(bit)) ? 1 : 0;
return 0;
}
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static int intel_xpower_pmic_update_power(struct regmap *regmap, int reg,
int bit, bool on)
{
int data;
if (regmap_read(regmap, reg, &data))
return -EIO;
if (on)
data |= BIT(bit);
else
data &= ~BIT(bit);
if (regmap_write(regmap, reg, data))
return -EIO;
return 0;
}
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/**
* intel_xpower_pmic_get_raw_temp(): Get raw temperature reading from the PMIC
*
* @regmap: regmap of the PMIC device
* @reg: register to get the reading
*
* We could get the sensor value by manipulating the HW regs here, but since
* the axp288 IIO driver may also access the same regs at the same time, the
* APIs provided by IIO subsystem are used here instead to avoid problems. As
* a result, the two passed in params are of no actual use.
*
* Return a positive value on success, errno on failure.
*/
static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
{
struct iio_channel *gpadc_chan;
int ret, val;
gpadc_chan = iio_channel_get(NULL, "axp288-system-temp");
if (IS_ERR_OR_NULL(gpadc_chan))
return -EACCES;
ret = iio_read_channel_raw(gpadc_chan, &val);
if (ret < 0)
val = ret;
iio_channel_release(gpadc_chan);
return val;
}
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static struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
.get_power = intel_xpower_pmic_get_power,
.update_power = intel_xpower_pmic_update_power,
.get_raw_temp = intel_xpower_pmic_get_raw_temp,
.power_table = power_table,
.power_table_count = ARRAY_SIZE(power_table),
.thermal_table = thermal_table,
.thermal_table_count = ARRAY_SIZE(thermal_table),
};
static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
acpi_physical_address address, u32 bit_width, u64 *value,
void *handler_context, void *region_context)
{
return AE_OK;
}
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static int intel_xpower_pmic_opregion_probe(struct platform_device *pdev)
{
struct device *parent = pdev->dev.parent;
struct axp20x_dev *axp20x = dev_get_drvdata(parent);
acpi_status status;
int result;
status = acpi_install_address_space_handler(ACPI_HANDLE(parent),
ACPI_ADR_SPACE_GPIO, intel_xpower_pmic_gpio_handler,
NULL, NULL);
if (ACPI_FAILURE(status))
return -ENODEV;
result = intel_pmic_install_opregion_handler(&pdev->dev,
ACPI_HANDLE(parent), axp20x->regmap,
&intel_xpower_pmic_opregion_data);
if (result)
acpi_remove_address_space_handler(ACPI_HANDLE(parent),
ACPI_ADR_SPACE_GPIO,
intel_xpower_pmic_gpio_handler);
return result;
}
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static struct platform_driver intel_xpower_pmic_opregion_driver = {
.probe = intel_xpower_pmic_opregion_probe,
.driver = {
.name = "axp288_pmic_acpi",
},
};
static int __init intel_xpower_pmic_opregion_driver_init(void)
{
return platform_driver_register(&intel_xpower_pmic_opregion_driver);
}
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module_init(intel_xpower_pmic_opregion_driver_init);
MODULE_DESCRIPTION("XPower AXP288 ACPI operation region driver");
MODULE_LICENSE("GPL");
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